Valve-gear for steam-engines.



No. 651,863. Patented June l9, I900.

J. B. KELLY. I VALVE GEAR FOR STEAM ENGINES. (Application filed No'v. 9,1:399.

(No Model.) 2 Sheets-kheet I.

No. e5|,ass. I Patented lune I9, 1900.

J. B. KELLY. VALVE GEAR FUR STEAM ENGINES.

She et 2.

(Application filed Nov. 9, 1899.)

2 Sheets (No Model.)

UNITED STATES PATENT OFFICE.

JOHN B. KELLY, QF PORTLAND, OREGON, ASSIGNOR OF ONE-HALF TO CHARLES L.VAN BUSKIRK, OF LODI, CALIFORNIA.

VALVE-G EAR FOR STEAM-ENGINES.

SPECIFICATION forming part of Letters Patent No. 651,863, dated'J'une19, 900. Applioationfiledllovember9,1899. SerialNo. 736,345. aromas.)

To all whom it mag/concern:

Be it known that 1, JOHN B. KELLY, a citi-i zen of the United States,residing at Portland, in the county of Multnomah and State of Oregon,have invented certain new and useful Improvements in Valve-Gear forSteam-Engines; and I do declare the following to be a full, clear, andexact description of the invention, such as will enable others skilledin the art to which it appertains to make and use the same.

The invention relates to steam-engines, and more particularly to thosefor operating crosscut-saws.

The object of the invention is to improve the construction shownanddescribed in Let ters Patent granted to me August 22, 1893, No. 503,665,whereby the engine is rendered more effective.

With this object in View the invention consists in certain features ofconstruction and combination of parts, which will be hereinafter fullydescribed and claimed.

In the accompanying drawings, Figure 1 is a side elevation of theimproved saw-engine, showing it applied to a crosscnt-saw. Fig. 2 is aview taken from the other side. i Fig. 3 is a top plan view. Fig. 4 is alongitudinal sectional view through the cylinder and its piston, showingin full lines a portion of the saw-blade and its head. Fig. 5 is across-sectional view on the line 00 a: of Fig. 3 looking in thedirection of the arrow 0.. similar view on line y y of Fig. 3 looking inthe direction of the arrow b. Fig; 7 is a do. tail perspective view of aportion of the piston. Fig. 8 is a sectional view of the same with thepacking removed. Fig. 9 is a detail perspective view of the packing.Fig. 10 is a vertical sectional view of one of the valve-chests. Fig. 11is a similar view taken at right angles to Fig. 10. Fig. 12 is a detailI perspective View of the rock-shaft with the trip-arms and valve-headsin place thereon. Fig. 13is an enlarged detail sectional view throughone of the valves, showing the manner of connecting the rock-shaftthereto. Fig. 14 is a detail perspective view of one of the saw-bladeheads and the trip secured thereto. Fig. 15 is a sectional view throughthe saw-blade and the head, showing the manner of connecting the Fig. 6is ahead to the blade. Fig. 16 is a detail perspective view of thecylinder-head sections and their interposed packing-strip.

The engine may be used for any purpose, but, as hereinbefore stated, isespecially designed for operating crosscut-saws.

As many of the parts shown in the present drawings are identical with orsubstantially the same as the corresponding parts shown in the LettersPatent above referred to, I will not enter into a detail description oftheir construction and operation, but will refer to them simply inconjunction with the other parts which form the subject-matter of thepresent application.

1 denotes the supporting-frame, and 2 the cylinder. One end of thecylinder is provided with a crank-arm 3, which is pivotally connected toone end of the supporting-frame, and said crank-arm is provided witha'guidepin 4, operating in a guide-eye 5, carried by the cylinder andprovided with a tensionspring 6, held in place by an adj usting-nut 7,for the same purpose as stated in the Letters Patent before referred to.The forward end of the cylinder is connected to the frame by a rope 8,which is rove about a drum 9 of a Windlass 10.

11 denotes a dog universally fulcrumed to the frame and adapted toengage the log.

12 denotes a securing-spikeicarried by the forward end of thesupporting-frame and adapted to be driven into the top of the log.

The cylinder 2 is provided with a longitudinal slot in its bottom toreceive-the arm 13 of the head 14, to which the saw orother tool ordevice to be driven is adapted to be secured. Each head of the cylinderis formed of an inner and outer metallic plate a b'andan interposedrubber sheetor packing a, clamped between said plates. The arm 13 ispivoted at its upper end to the piston 15 and is provided with atransversely-curved eye or aperture 16 to receive a flexible steel bandor strap 17, which closes the slot in the bottom of the cylinderthroughout its entire length except at that point where it passesthrough the arm 13. v

The piston has deep annular grooves formed. in its ends, in which areplaced angular packing-blocks 18. Packing-strips 18 are ing-blocks aredesigned for this purpose, it is" possible that steam may pass betweenthe ends of the piston and be confined between thepacking-blocks, theupper side of the piston, and the upper side of the cylinder, thusexerting a load upon the piston. In order to prevent the accumulation ofsteam at this point, I form a hole 20 in the upper wall of the piston toallow of the escape of steam should it work past the packing-blocks.

The lower side of the piston may, if desired,

be provided with a wearing-shoe 21, grooved at 22, so as to straddle theband or tape and prevent wear of the same.

' No claim is made in the present case to the novel form of pistonherein shown and described, as the same forms the subject-matter of adivisional application for patent filed February 8, 1900, Serial No.4,491.

23 denotes valve-chests arranged at each end of the cylinder on itsside. These valve: chests have each a port 24, communicating with thecylinder,- an inlet-port 25, and an exhaust-port 26. 27 denotes rotaryvalve-heads arranged within said valve-chests and adapted to establishcommunication between the inletports 24 25 and. to cut off communicationbe tween the inlet-ports 24 25 and to establish communication betweenthe ports 24 26.

28 denotes a rock-shaft connecting the two valve-heads. This rock-shaftis provided with a key at each end, which fits into. a slot in one endof each valve-head. This construction admits of a slightlongitudinalmovement of the shaft to compensate for any bending or distortion ofsaid shaft.

'29 denotes two trip-arms longitudinally adjustably secured upon saidshaft to rock therewith. These arms project from said shaft inwardlytoward the cylinder, one slightly more than the other, and are adaptedto be alternately engaged by the trip-head 30,.carried on the saw-bladehead,whereby the shaft will be alternately rocked in opposite directionsand the valves actuated and thereby be opened and closed to admit steamalter nately at the opposite ends of the cylinder and to exhaustittherefrom. Then the triphead engages one of the trip-arms, owing tothe shape of the head, the arm will be gradually moved to one side, andthe instant it passes its dead-center it is suddenly thrown its extremelimit by a coil-sprin g 31, mounted upon a rod 32, the lower end ofwhich is pivpted to a lug 33, fixed to the rock-shaft, and the upper endof which projects through the arm 34 of a bracket 35, secured to theside of the cylinder, and is provided with nuts 36. The energy of thespring is exerted downward.

' 37 denotes a stop secured to the under side of the cylinder near itsforward end on opposite sides of the slot in said cylinder, and 38denotes a roller-stop secured to the under side of the cylinder at itsrear end. These stops may be formed of rubber, leather, or any analogousor suitable material and are adapted to receive the jar of the saw-bladehead in the event that too much steam is admitted to the cylinder orshould the attendant fail to close off steam after the blade has sawedthrough the log.

39 denotes a shoe secured to the rear end of the head 14 and madevertically adjustable in slots 40 by bolts 41. This shoe is adapted toslide along the under side of the cylinder and by means of itsadjustment enables the saw-blade or other tool or device to. be set atproper position with respect to said cylinder 43 denotes a rod fixed. tothe valve-chests and parallel. with the rock-shaft.

43 denotes sliding sleeves having arms 44 to engage the trips and ahandle 46 de notes a spring-dog pivoted to said sleeves and adapted toengage notches 47 formed in the rod. By grasping the handle and the dogand pressing one toward the other the dog will be disengaged from thenotches and permit of the adjustment of the trips to regulate the strokeof the piston. The toes of these dogs are made adjustable by aslot-and-bolt connection to compensate for wear. 7

48 denotes inlet-pipes extending to and communicating with the inletports 25 of the valve-casin g. Each of these pipes. is providedwith acheck-valve,which form an air-cushion between the piston and thecylinder-heads at each stroke of the piston, and thereby prevent thelatter striking said heads. 49 denotes an exhaust-pipe communicatingwith the exhaust-ports 260i the valve-chests. To steady the forward endof the sawrblade in its strokes, I provide a guide which consists of acurved rod 50, having one end pivoted in one of'a series of holes' 51.in the handle end of the frame 1 and its other end pivoted to a forkedhead 52,, which straddles the Sawblade. A sheave 53 is journaled uponthe pivot and engages the back of the blade. The guide is held toitswork by..a spring 54, g In the starting of the engine should" the valvesbe in such a position as not to admit the steam to the proper end of thecylinder the shaft 28 may be turned by the handle 55 to properly adjustthe. valves,

It will of course be understood that various changes in the form,proportion, and the minor details. of construction .may be resorted towithout departing from the principle or sacrificing any of theadvantages of. this inve'ntion. I v I j c Having thus described theinvention, what is claimed, and desired to be secured by Let-- tersPatent, is

1. The combination with the cylinder; of the piston, valve-chestscommunicating with said cylinder, valves arranged within said chests toadmit steam to and exhaust it from said cylinder, a rock-shaftconnecting said valves, trip-arms secured upon said shaft to rotatetherewith and slide longitudinally thereupon, a fixed rod parallel withsaid shaft, sleeves mounted upon said rod and connected with said arms,and means for locking said sleeves in longitudinal adjustment on saidrod, substantially as and for the purpose set forth.

2. The combination with the longitudinallyslotted cylinder, and a pistonarranged therein and provided with an attaching-arm projecting throughthe slot in the cylinder, and stops carried by said cylinder; of theflexible strap arranged within the cylinder to cover said slot andpassing through a guide in the piston, a head secured to saidattaching-arm, and a shoe vertically adjustably secured to nesses.

JOHN B. KELLY. "Witnesses:

BENJ. G. OowL, JAMEs KoEHL.

